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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad9278699ae54e060cebdfb0859e1ef177887c1dd268eaa0be7ea5fcdea66e2' 
  AND token = 'ducgiKqJRoTl52xzI3Lw+5zUodZaEjWmhLqZ0XrbZ0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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