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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c15381ddf5f81d8d628df8e4648f8b71701fad9a12dffcbcec25785d033820' 
  AND token = 'KR5L2enFiSsbf9AkmSup54azkfJc5IqgSjcDqSvZB3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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