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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd420d29b9c624208f6b0e9ac07e0b4b0192c3ac4cead48b94e0b1e33e4a24a3' 
  AND token = '/4gOHiuufuODTqL8xHGZ+AGSskkNkNe64BwqLjjH+/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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