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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f01e24e94ca424a79c2e921af9f7def62d97fe6db8bf882f5b6eac11f263a92' 
  AND token = 'aNfTp5yXc1TLWqeJN0DlgrmMwIQJTSle7x8MOTLZddQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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