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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14bc8d0ed30c388311a18c0cf6a4ccecd10e161cd24c363ff6e76e589f7d3e1' 
  AND token = 'd4Vd/18zl5/TuXKtPlxoXyUR0f9lZc9kH/GUyqFiWbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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