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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6324003cf6570d32393cf6fda2fe3317f7932526114ba8c3d9f083e2e4ffea' 
  AND token = 'Uxae1SCZp7iJLcwIYma6CiIf53gdSoW+jh1uhyjAOlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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