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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6fa84a726d0f7ca7302229ae5a2c47e87f77d850ee77421e798cdfee110d0be' 
  AND token = '0LhJGRtF47Fbzdm6n81pZqX5giH3yAFDENz5zZb5iD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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