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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4462109649de856dfb782c82bb16c50e5830010d1f729909d4fa0cc9334ea9fa' 
  AND token = 'BVoeveHR+D6y/eDtlZaHv4YyneAu8KYM463Kjhg23o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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