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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a993d5018503a4d60d0099c766702a4d80da1d05526489781a5188730b040a9' 
  AND token = '7r/v5L0J8DYfahOXj+ABmDcVWdoUfb2GDVqfK613+to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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