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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1376612ac1a5bfc725466467578d8fca6d38093ad94b4094d75b44a07672a3f9' 
  AND token = '+ay94D1CkbQuP0Nc/EyWnUllQmZDkSmo7mtv0I99ZC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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