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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c269b5432c0754e6c6e52ca583d61eb343e478a6b71027849a7a50168714d8f' 
  AND token = '9aaorXLHqYKoyRk+CMLB9NtEPhuck2hkVaSdD+mU/QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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