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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc65e23b066f8ba96227b49bacf6288744cb533934e3db0fd75b895cf98addcb' 
  AND token = 'rOv1zJKZT+0Nl4jvEg04mufkOeu436D22uBtDZ6cusc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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