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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2678dd461afdcf9c15ce0d7bfddfe4c789e22187307c09ddb6c3b7deb48842d0' 
  AND token = 'pl++4seH9X5cBSjgyOFacIztDQPlgBrRM0ijdMa8iwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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