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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a6e3cd08d4e9f0c6475268a77a987f751b38a6df67a318bb4d64ec0553166f' 
  AND token = 'uhautrzM9ZIt61mV6sTNzgf+AAfB1y3W4APDHFuXlMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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