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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961723cb88d9589ad3b50660d88a9a1833b6c33af830b6c608f896ec9b207fde' 
  AND token = 'n7MgppMGLEv/XQlina/gwvn/CH1857zGGdGakvHpG/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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