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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc80d9f116f796dd094499f5000f0e1d964eaaf9c897363acd0bb5183c37fa70' 
  AND token = 'hxSevwLcboia0XgH4Ceona9LK3i4174jtSn2VoPKgcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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