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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b439fd1d35531c806d17da164319d30b0656b6b8ce9fff3ad410315f13af8a' 
  AND token = 'e98BA4xdFl+QKo18kNyUtaJR35+ZcpdRi2w20UwphkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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