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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155bbb5c8f6e1ed146c44c655907b1e76ab52c8014ee2b2062d27e1d4f508a84' 
  AND token = 'hvY/qJ02v7Vpb/zh7in24K0FlcHBAD1G91oKiWSsb6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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