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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d99ce4e79f6062b15b8159285d692ea4493c3337158f0c29dd36f1bfd0dc3a' 
  AND token = 'Kbze8b5gubNgaXPqnXLJUyFE07kvn2Dqboor//iJHJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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