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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef20a4c00ae4a8bdc75525263818b9c5213a873fd3ce61031e0ce4fe5e16fc5a' 
  AND token = 'bpnLsk+f4A97BM6A7iZVtdoJsnNOZjRPNNboniXILWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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