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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a528ff1a5f0701d9c87592334c2a99904d34cc168b41820f491d8317b9b704' 
  AND token = 'ATuvpNseu8JkjIhGbgdz0N54sRs7Of/yyRM6JUSRXLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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