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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70bfa2c5eac8290abc159d08a6a0f939043e163e2f6f755ef4204597da5408b0' 
  AND token = 'ZNhMDsCZ0yiUsDP9FSDdbiGoSxHqinHVlXKPcqjmrfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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