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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf0c62b9632a47c642e6a1d4a492ab7dd27a5528e042a6475a89ebcf59a16ba' 
  AND token = 'W2q+VVYZk6ApMsuutrEa/Cimx20YhHG2C683TDUDZDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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