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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5940a9253100c0e035a8862cf7b8732514a268927ab24b1f8820c2359d9ee49' 
  AND token = '/LskQ7NhvUvdKUJS9WnhEOkFp/AoOnnrI7qLcpNHKN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00157

JSON explain

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