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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f872ea8fae300d41af7804c3a95703ec095f7904ae88ebac09ef627cfcb7bb' 
  AND token = 'oIfVaAg99mul209ZDpHwlIaQVNwJWOw2sblbrnf8arQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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