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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5407dae443e168ca8d2f67c6f1f81ccabe0e17ca7b5a0e222c6dc08e96121b' 
  AND token = 'zZJjl8Xq9q26GLhRURbfdBJ1BDapO0s6XhrtofMdmK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}