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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf63a7b4dc888a50377c3d2deb9b4dae77af0a9f5bf3300e50fc0dbb43bd462' 
  AND token = 'OWprACSjgh0RK43iIgPLWqSzlSwQCA29ljWXGFyIo+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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