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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea71e1a6f0bb16ffc8b911332c222946338256eec088fede2b2c7bb0aed635be' 
  AND token = 'fnjEL7f2Yem3LD4GLfbOl2vgrm1SzBss+nFSh8gX5m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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