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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713b6b1716f55a83205ef03989030d34cbaa09b94834be83f9fd74cfc9ed5579' 
  AND token = 'j1HUu7xYUbGzp7kQShPdAfH20P9SCDZV1Wpq7ga93bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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