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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe72a08114900c5eec0e9fc6fc0ed942fd14147dcf6d28b141f176a6e90da7c' 
  AND token = 'Z+9TMiXnx+xen7j5ttrbkgPB/W4LyKlpG1BDe5RvwZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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