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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ac0836462d2f63c35da111dae8bc76d6a7c5c59c43d8f5fa6981dd393bd925' 
  AND token = 'Gqgc9Cv8z8wN9DRLD7BP9W7MiafRlfpBbFJVluilUCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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