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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562bf67789a694df0e31cf84546a549aa6a08cd075b38bc3d6e81783a9378b60' 
  AND token = '3JWHsQaDxIJL28RbLy0WqD1nNUJz5djwfQ0Av/kMnB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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