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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b961795933fd71da657de13af1d9bcc03565dbe75511e81cb9ab37adb7dfd808' 
  AND token = 'yd2qHdV54c0RmVAo3JLQywRpt70nU1rOAgV4t9PQu2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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