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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '459d7c10b870da4f2b916dfc6dc0ea0d791eb78bdd5cd3ab6768564dd0d11d51' 
  AND token = 'jN5FO3tDrgRlGlNI9AaAVJgN2lVNviomzhWISWq9G8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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