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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f7bc6a1df4bf118f523191b7ca474e32f3fa02dec3e8790395f0593b971d68' 
  AND token = 'l0JkbgMQOXJ1qcPO75y41NiCV7U5DIA8T0C0V9JthcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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