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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44d28a5bdf14221c163092e0ee611a2af2829e9af61a0b3d222e2c881764c7f' 
  AND token = 'yqKbnhJyVoyZu7fVdA4H7DdcwfLpg9UhbkMwWj0Y1PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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