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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '376c7e07ed00c1a77ea736a26917ced3f7b9727507f5c68b8468c5493bbd525b' 
  AND token = 'LLMxy71JWr8RxDuWVjavzY80bwIipO2H9aTnvwwPs64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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