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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d760bdf5b66a436a3cce6d9cb00a28e17c4a5726731ae0b8e6332717911184' 
  AND token = 'wIE6NGUmY6miP70AgZcsN2PdzwTxcBdOXxRs0inAwiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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