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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40f661656c5b6fb2b4dd41deca9453f15fdd6e72b96b72cba4395aa596651eb' 
  AND token = 'KZAcP9IlL35LGpGxFvkrW0xpaXxr0RaOan2F7EnP1ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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