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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926b9775d3bf3679f95549f81eef6b50bf7e047014a3349e3b4c4c640cc04910' 
  AND token = 'zzBv5y5dsl7cHRnQYHdQj6QAI864IwT4NcTsNolPEiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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