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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea1b77118705cab71a6a225e6760fff3ca2ad490b3680a98a1be53cf76d47ba' 
  AND token = 'NZxbqc8qpPi6BlqUKPMYcHpK29YeHYnM6HnbCmP9dhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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