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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a51697cbe0249d0b79115a66027eb565a55b958e64905266ff1c9aa2a58a60c' 
  AND token = 'QBDa5FBpO4RcrNHqIcoFBVTIcQnjpaJMeM465lUc9H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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