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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74fc6a92acebb840acac0ee76dfba91b38d14922eb25d21de162a61e5bee2d2b' 
  AND token = 'YnCdg4+tS0sEokN+kmfuFkSTuqkgOogl+v3Jq8BMPEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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