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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf2a37e2ebc57b74bf504bf0b5bc146bcbd3d8b471d560f81ece67475e5207a' 
  AND token = '5Q7wt0RVunC2wXv/O0JbqNqogsF5lQJdV59pMFMUb1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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