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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab30c242f9aed6f4358f6dc2f8250f498aed576fa9c1b8bbd8ea011b36e976d2' 
  AND token = 'hAl43W6qt7fPQ0Md0mgLD153CWelbt2aj6yZHNhI8X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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