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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb6d707a136ba0b073be7d8e7d9a25740e6475eb957d423f5dc82ccaf624a99' 
  AND token = 'ixX5XvD0dGTUczTPMCvual91h/PgJ/UH/5Jb00CBGIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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