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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596ae4feab1f6cad5ab2c59843141d32ae22767417953655cf9a3a3cf673168b' 
  AND token = 'gA4IIpmu+8Idqv/sc+GOx2yxha9//gYk3pOcbzdeoLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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