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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6253d7bfd23eef24c93ca655dbec75e7a8cb2513ea163a255a145445bfa38b1' 
  AND token = 'zpUOFtbWWmL3o/7m7e8Dn67xueciDsvDwGL2+80ZXKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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