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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f5e672cec48bb24f1b3241a837fdee59096a666fac631e076dda65b7ce950a0' 
  AND token = 'w0yIdK6FFo9oUtGM6bU2pzFnHW2LFgYCV/i6qRxFgCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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