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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a84796d029317d1ebe238e5fb3a57a5acdc593e02ed7d7f7a5a86447647576c' 
  AND token = 'RcNq+KNFQ2O4sqVvLnBsuHa4KV/h8dz4FalcrBvXVTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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