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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf9e0c9675e421145afd1262f8ea55734233f730b7a986321758c3a7dd60972' 
  AND token = 'VpVWnwdmzUtfyILUxYMGOo6c9k6HDcsvF36l5wZH4vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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