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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6152618d6a66b24ed4e08050ba2978d7a026c2c7be8ed42bf4296341a262dfaa' 
  AND token = '9BA/Kox9QLns/cHpNl5w/RiVBPZVeofa2a4xRLfQlm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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