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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf29ac2ca4f082087e1f4c3cf1b68081c4065845a1896cfa6eed4c8f85aaf9c5' 
  AND token = 'ATDZ2LvXWqPYdxOR0v6y+OY9UTqliA2RZS8Fg1ImyGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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