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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1510ab0823d37d47928c214996d015400308a9b0c2fd3e8ef7d8cea439a6fd8' 
  AND token = 'kMTNEFIDChkeX8mXcKx8VvsE0ChPbhaj67jaIB1kAUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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