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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1840789bbec8d2ca74dcc8ba00db3d94973fb645cd1907d9a2e092c5ad725c11' 
  AND token = 'IveHWaCYDhKSiIORFg4L6EW1YNsAt+ZdJmutq5aQUh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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