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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a73a8d1972ca41a27b990905416a72ad8f37945592605d76040bb7a80765a37' 
  AND token = 'L9/IVFa3RKnv7IMVxpdFA2VuiUzD6ijcJgI/VT5y6yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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