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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c229c3e33e220fa8465bcf92ea4d9026be29a1b78d8e6c354dd90ee234791345' 
  AND token = 'EDUsoMpmXWnFMhzMzeYO9daADeUDTKuuMIQnXd0Cezs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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