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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec67e343defcb8cede0542d6a95468ab33ebd756ea16fbfcf49df4c52af322d' 
  AND token = 'lcSQNSa2XnFp9KGOgvAly6Ae4EaX2kNsZNPWa275M0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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