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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a102b6b48450228946a866c1ff3b16ada0946a7712f096157a0d8239524a1b' 
  AND token = 'M11A2JDlLy6B0INkJMLSGXGyosIKRBlWC0H+HZFLIDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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