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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b925c582832696e3de060aef352a6f687df4772b14e1d88602ee6ea14af9329' 
  AND token = 'pUnFk7ieo3ExfEt8DhK+op+ngfXLnAQnLj1IHdn0vVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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