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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9059a97d23dba96da76c6f64ac9f1385933423c45641eadd25c3665eb46a17' 
  AND token = '4xdMRgJf+7CtOWlLrj89yTG+CNmtyTyURrkyayAZqaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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